Marla and John Ray relocated to Denver from Washington, D.C. in 2008, partly because of the weather. But there are days they’d never know they left the stifling Potomac lowlands because their townhouse in central Denver is so hot.
Marla, who owns Denver’s Moving Boxes, works from a third-floor bonus room in her house, a space which fries several months a year. “We’ll have the heat on in one roo…